4Gb RAM in XP: how to increase maximum XP RAM limit

By default, Windows XP maximum RAM amount is 2Gb. This operative system won't use more memory even with more RAM memory available already installed on the motherboard of our PC.

But there are some tricks to avoid this XP RAM limit, and make Windows XP use even 3Gb and even 4Gb of RAM when running some applications.

How to use 3Gb: increase Windows XP RAM limit

Let's open the BOOT.INI file. It is possible that this file could remain as a hidden file in some Windows XP versions, even after enabling the Windows "display hidden files" option. But to open this file you just need to type C:\boot.ini in the address bar of the Windows XP File Explorer.

Then let's find the following line of code inside such Windows configuration file:

Reading 4 Gb RAM in Windows XP

To reach the Windows XP maximum RAM amount of 4Gb we have to add this configuration option to the previous Windows code: /PAE just before /3GB. The configuration file for the maximum RAM limit in XP would be as follows: